craig



(No Model.) 2 Sheets-Sheet 1. W. CRAIG.

APPARATUS FOR PRODUCING CIRCULATION IN STEAM BOILERS. No. 351,044. Patented Oct. 19, 1886.

N. PETERS. phdwhlhagmpher, Washinghm, o1;v

(No Model.) 2 Sheets-Sheet 2.

W. CRAIG.

APPARATUS FOR PRODUOING GIRGULATION IN STEAM BOILERS.

No. 351,044. Patented Oct. 19, 1886.

N. PETERS. FhnlaLlihogmplmr wawn wu. 0.0

UNITED STATES XVILLIAM CRAIG, OF BROOKLYN, NE\V YORK.

SPECIFICATION forming part of Letters Patent No. 351,04 dated October 19, 1886.

Application filed July 15, 1886. Serial No. 208,052. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM CRAIG, of the city of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Apparatus for Pro ducing the Circulation of \Vater in Steanr Boilers, of which the following is a specification.

My invention relates to apparatus whereby water may be withdrawn from the bottom of a boiler having an internal furnace and delivered into the upper part of the boiler by the inducing force of an injecting current of feedwater. In a marine boiler having internal furnaces the water in the bottom of the boiler ordinarily remains very much colder than the water in the upper part of the boiler for a long time after the boiler is set in operation, and by the employment of an injecting current of feed-water to draw water from the bottom of the boiler and discharge it into the upper part of the boiler the water in the boiler will soon be brought to a nearly uniform temperature throughout, and the dangers resulting from unequal expansion of the boiler by the varying temperature in the bottom and upper part of the boilerwill be avoided.

In carrying out my invention I employ an injector with the nozzle of which the feed-pipe is directly connected, or with which is connected the discharge-pipe leading from an injector which is operated by a steam-jet to produce the flow of iced-water, and the injector having its nozzle connected with the feed supply, as above described, is connected either directly or indirectly by a suction-pipe with the lower part of the boiler and by a delivcry-pipe with the upper part of the boiler. The current of feedwvater, whether it be supplied from a feed-pump or from a steam-injector, therefore acts to induce a flow of water from the bottom or lower portion of the boiler into the upper portion thereof, and in order to secure the proper operation of the apparatus it is necessary that the current of feedwater should not pass through the suctionpipe into the boiler, as such operation of the apparatus would frustrate the object of Inyin- Vention.

My invention consists in the combination, with a steam-boiler having an internal furnacc, of an injector through the nozzle of which feed-water is supplied, and which is connected by a suctionpipe with the lower portion of the boiler, and by a delivery-pipe with the upper portion of the boiler, and a check-valve in the suction-pipe between the injector and the boiler, and opening outward from the boiler. By this check-valve the feed-water is prevented from flowing through the suction-pipe into the boiler, and hence the inducing force of the injecting current of feedwater is made effective in producing the flow from the bottom of the boiler through the suc tion-pipe, injector, and delivery-pipe into the upper part of the boiler.

The invention also consists in the combination, with a steam boiler having an internal furnace and a steaminjector for supplying feed-water thereto, of a second injector with the nozzle of which the delivery-pipe from the first injector is connected, and which is itself connected by a suction-pipe with the lower portion of the boiler and by a delivery-pipe with the upper portion of the boiler. \Vith such a combination of parts the first injector,

I operated by a steam-jet. forces the feed-water through the nozzle of the second injector and causes it to induce a tlow of water from the lower portion of the boiler to the upper portion thereof.

In the accompanying drawings, Figure 1 is a rear elevation, and Fig. 2 is a partial longitudinal section, of a boiler having three internal furnaces and having my apparatus applied thereto, such apparatus being shown partlyin section in Fig. 1. Fig. 3 is a side elevation ofa part ofaboiler having my apparatus in a modified form applied thereto; and Figs. 4 and 5 are sectional views upon a larger scale, representing the injectors and appurtenances as illustrated in Figs. 1 and 3, respectively.

Similar letters of reference designate corresponding parts in all the figures.

A designates the boiler proper, and A three internal furnaces thereof, which are represented by dotted lines in Fig. 1.

Referring now to Figs. 1, 2, and 4, B designates an injector with a nozzle, B,with which the feed-pipe O communicates, and which is indirectly connected by a pipe, D, with the bottom of the boiler, and directly connected by a pipe, E, with the upper part ofthe boiler. upward to the injector B, and thence upward I have also here represented a steam-injector, into the boiler through the pipe E E. I have F, with which the pipe D directly communi--- also here represented other pipes, D D cates, and through which it is connected with which connect with the pipe D under control 70 5 the feed-water injector B, and this steam inof valves (1 d d. I have also shown a pipe,

jeetor F may be operated by steam, which may E", leading from the feed-water injector Band be taken from a donkey-boiler through apipe, controlled by a valve, 6. These several pipes f, or from the main boiler A through a pipe, D &e.,-and E form no part of my invention, f, and which is passed into the injector Funand they provide, when thesteam-injectorEis 75 ro der control of the valvef. Thesupplypipe used, for drawing water from the sea in case D and the delivery-pipe E are continued by of fire, or from the bilge in case of leakage, or prolongations D E within the boiler A, as fronia hydrant or freshwater supply when shown in Fig. 2, and such prolongations are th'evessel is in dock, and for discharging waperforated throughout their length, so that the ter through the pipe E", either overboard, if 3 i pipe D will draw water from different parts the water is taken from the bilge, or into any of the boiler, and the pipe IE will return the part of the vessel in case of fire. The steamwater into different parts of the boiler, and injector F may be operated by steam from a i will thereby sooner produce a nearly-uniform donkey-boiler to circulate the water in the temperature of the waterintheboiler. Ihaive main boiler while getting up steam in the 3 2o represented stop-valves d e in the pipes D E, boiler A, and after steam is gotten up'the so that communication between suchpipes and steam-injector may be stopped and feedtheir prolongations within the boiler may be water may beintrodu'ced' through the pipe 0 controlled, and I havealso representeda stopand nozzle B, thereby inducing a flow of valve, 0, in the feed-pipe G. water through the'pipes D Efrom the bottom 90 In Fig. 4 I have represented in' sectional of theboiler. I

view and upon a larger scale the injector and In the example of my invention shown in appurtenanceswhich arerepresentedin Fig. 1. Figs. 3- and 5 adifferent arrangement of the I do not desire to limit my invention to the injectors is represented. In these latter figemployment of any particular kind of steamures the steam-injector F has the feed-pipe 0 9r o injector F, as an in'ector of any of the well connected with it, and steam introduced known forms may be employed, and the inthrough the pipe f, induces the how of feedjector F, which is shown in seetiionaf view in water through the checlbvalve h and the in- Fig. 4:, simply illustrates one form of injector jector-no'zzl'e B of the second injector, B, upwhich may be employed. The injector F is ward 'th rough-the pipe E' into the upper part 100 5 provided with asteam-nozzlef within'which of the boiler. The second injector, B, is diis centrally fitted an adjustable regu'lati'ngrectly connected by a suction-pipe, D; with spindle, f and f designates a combining-tube, thebottom' of the'boi'ler,andthe current of feedwhich has the usual overflow-opening, f". 'water forced through the nozzle B by the In the operation of my apparatus the feedsteam-injector F will induce in the secondin- 0 water which is introduced through the pipe'O ject'or, B, a flow' of water from the bottom of and issues from the nozzle B of the injector'B the boiler through the pipes Dand E into the forms an injecting current, which i nduces'the" upper part. of the boiler. In this example of flow of water from the bottom of the boiler the invention also, the suction-pipeDcontai'ns through the pipeD Dand deliverssuchwater' a check-valve, d, which prevents the feedn into the upper part of the boiler through the water forced" through the nozzle B by the acpipe E E- tion of the steam-injector F fromtaking a In order to insure the proper action of the downward coursethrough the pipe I) ihto't'he apparatusit is necessary that the feed-water, bottom of the boiler. which-is cold,an'd thereforeisofgreaterspecific In Fig; 5' I have. illustrated in sectional 11 0 gravity than the water in the boiler after the i view an injector and appurtenances arranged furnaces therein are lighted, should be preas represented in Fig; 3. The-injector Fis or vented from taking a downward course and may be like that shown in Fig. 4 for purposes entering the bottom of the boiler through the I of illustration. In this example of my invenpipe D D, as such a course of the feed Water tionalsoan injector of any other suitable-con- 1 20 would entirely frustrate the purpose of theapstruction' other than that shown may be emparatus. To prevent this I provide in the ployedl pipe D,and betweenthe connection of such pipe In Fig. 3 the pipes'D E are provided with with the boiler and the injector, a check-valve, stop and check valves 01 e. d, which is represented in section in Fig. 4, Y Where boilers are already provided with a 12 and which may be of any suitable-construction, steam-injector for supplying them with feedso long as it is arranged toopen outward from water, my invention, as shown in Figs. 3 and the boilerand in a direction toward the injector 4, may be'added at small expense. It is only B. This check-valve will effectually prevent necessary to disconnect the delivery-pipe of thefl W f h e d-water from the injector B' j the steam-injector fromthe boiler and to con- 1 0 6 downward through the pipe D, but will per nect it beyond the-usual check-valve, h, with mit water to flow freely from" the pipe D D the nozzle B of the second injector, B, hav i ing its suction and delivery pipes D E connected with the lower and upper parts of the boiler.

What Iolaim as my invention, and desire to secure by Letters Patent, is

1. Thecombination,with astealn-boilerhaving an internal furnace, of an injector through the nozzle of which feed water is supplied, and which is connected by a suction-pipe with the lower portion of the boiler and by a delivery-pipe with the upper portion of the boiler, and a check-valve in the suction-pipe between the injector and the boiler and opening outward from the boiler, substantially asherein described.

W'ILLIAM CRAIG.

Witnesses:

FREDK. HAYNES, HENRY J. MCBRIDE. 

